Most organelles show duplication in cell cycle during

The correct option is D $G_2$ - phase
A. During G1- phase, cells grow and synthesize the 20 amino acids needed to manufacture proteins later on.

B. Cell cycle begins with the resting phase. During this phase, cells are at ''rest''.

C. During S-phase DNA synthesis occurs.

D. During this stage, organelles are replicated and proteins are synthesized.

So. the correct answer is '$G_2$- phase".